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78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/* Quicktex Texture Compression Library
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Copyright (C) 2021-2022 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cassert>
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#include <cstdint>
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#include <functional>
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#include <limits>
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#include <numeric>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include "util/ranges.h"
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#include "xsimd/xsimd.hpp"
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namespace quicktex {
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using std::abs; // abs overload for builtin types
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using xsimd::abs; // abs overload for xsimd buffers
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template <typename S>
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requires requires(S &s) { s.abs(); }
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constexpr S abs(S value) {
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return value.abs();
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}
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template <typename S>
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requires std::is_scalar_v<S>
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constexpr S clamp(S value, S low, S high) {
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assert(low <= high);
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if (value < low) return low;
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if (value > high) return high;
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return value;
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}
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template <typename S, typename A>
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constexpr xsimd::batch<S, A> clamp(xsimd::batch<S, A> value, const xsimd::batch<S, A> &low,
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const xsimd::batch<S, A> &high) {
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return xsimd::clip(value, low, high);
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}
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template <typename S, typename A>
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constexpr xsimd::batch<S, A> clamp(xsimd::batch<S, A> value, const S &low, const S &high) {
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return clamp(value, xsimd::broadcast(low), xsimd::broadcast(high));
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}
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template <typename S>
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requires requires(S &s) { s.sum(); }
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constexpr auto sum(S value) {
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return value.sum();
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}
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template <typename S>
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requires std::is_scalar_v<S>
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constexpr auto sum(S value) {
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return value;
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// horizontally adding a scalar is a noop
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}
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template <typename S, typename A> constexpr auto sum(xsimd::batch<S, A> value) { return xsimd::hadd(value); }
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} // namespace quicktex
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